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/*
* Copyright (c) 2009-2011, The Regents of the University of California,
* through Lawrence Berkeley National Laboratory (subject to receipt of any
* required approvals from the U.S. Dept. of Energy). All rights reserved.
*
* This code is distributed under a BSD style license, see the LICENSE file
* for complete information.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <stdint.h>
#include <sys/time.h>
#include <sys/select.h>
#include "iperf.h"
#include "iperf_api.h"
#include "iperf_util.h"
#include "iperf_udp.h"
#include "timer.h"
#include "net.h"
/* iperf_udp_recv
*
* receives the data for UDP
*/
int
iperf_udp_recv(struct iperf_stream *sp)
{
int r;
int size = sp->settings->blksize;
int sec, usec, pcount;
double transit = 0, d = 0;
struct timeval sent_time, arrival_time;
r = Nread(sp->socket, sp->buffer, size, Pudp);
if (r < 0)
return r;
sp->result->bytes_received += r;
sp->result->bytes_received_this_interval += r;
memcpy(&sec, sp->buffer, sizeof(sec));
memcpy(&usec, sp->buffer+4, sizeof(usec));
memcpy(&pcount, sp->buffer+8, sizeof(pcount));
sec = ntohl(sec);
usec = ntohl(usec);
pcount = ntohl(pcount);
sent_time.tv_sec = sec;
sent_time.tv_usec = usec;
/* Out of order packets */
if (pcount >= sp->packet_count + 1) {
if (pcount > sp->packet_count + 1) {
sp->cnt_error += (pcount - 1) - sp->packet_count;
}
sp->packet_count = pcount;
} else {
sp->outoforder_packets++;
iperf_err(sp->test, "OUT OF ORDER - incoming packet = %d and received packet = %d AND SP = %d", pcount, sp->packet_count, sp->socket);
}
/* jitter measurement */
gettimeofday(&arrival_time, NULL);
transit = timeval_diff(&sent_time, &arrival_time);
d = transit - sp->prev_transit;
if (d < 0)
d = -d;
sp->prev_transit = transit;
// XXX: This is NOT the way to calculate jitter
// J = |(R1 - S1) - (R0 - S0)| [/ number of packets, for average]
sp->jitter += (d - sp->jitter) / 16.0;
return r;
}
/* iperf_udp_send
*
* sends the data for UDP
*/
int
iperf_udp_send(struct iperf_stream *sp)
{
int r;
uint64_t sec, usec, pcount;
int size = sp->settings->blksize;
struct timeval before;
gettimeofday(&before, 0);
++sp->packet_count;
sec = htonl(before.tv_sec);
usec = htonl(before.tv_usec);
pcount = htonl(sp->packet_count);
memcpy(sp->buffer, &sec, sizeof(sec));
memcpy(sp->buffer+4, &usec, sizeof(usec));
memcpy(sp->buffer+8, &pcount, sizeof(pcount));
r = Nwrite(sp->socket, sp->buffer, size, Pudp);
if (r < 0)
return r;
sp->result->bytes_sent += r;
sp->result->bytes_sent_this_interval += r;
return r;
}
/**************************************************************************/
/* iperf_udp_accept
*
* accepts a new UDP connection
*/
int
iperf_udp_accept(struct iperf_test *test)
{
struct sockaddr_storage sa_peer;
int buf;
socklen_t len;
int sz, s;
s = test->prot_listener;
len = sizeof(sa_peer);
if ((sz = recvfrom(test->prot_listener, &buf, sizeof(buf), 0, (struct sockaddr *) &sa_peer, &len)) < 0) {
i_errno = IESTREAMACCEPT;
return -1;
}
if (connect(s, (struct sockaddr *) &sa_peer, len) < 0) {
i_errno = IESTREAMACCEPT;
return -1;
}
test->prot_listener = netannounce(test->settings->domain, Pudp, test->bind_address, test->server_port);
if (test->prot_listener < 0) {
i_errno = IESTREAMLISTEN;
return -1;
}
FD_SET(test->prot_listener, &test->read_set);
test->max_fd = (test->max_fd < test->prot_listener) ? test->prot_listener : test->max_fd;
/* Let the client know we're ready "accept" another UDP "stream" */
buf = 987654321;
if (write(s, &buf, sizeof(buf)) < 0) {
i_errno = IESTREAMWRITE;
return -1;
}
return s;
}
/* iperf_udp_listen
*
* start up a listener for UDP stream connections
*/
int
iperf_udp_listen(struct iperf_test *test)
{
int s;
if ((s = netannounce(test->settings->domain, Pudp, test->bind_address, test->server_port)) < 0) {
i_errno = IESTREAMLISTEN;
return -1;
}
return s;
}
/* iperf_udp_connect
*
* connect to a TCP stream listener
*/
int
iperf_udp_connect(struct iperf_test *test)
{
int s, buf, sz;
if ((s = netdial(test->settings->domain, Pudp, test->bind_address, test->server_hostname, test->server_port)) < 0) {
i_errno = IESTREAMCONNECT;
return -1;
}
/* Write to the UDP stream to let the server know we're here. */
buf = 123456789;
if (write(s, &buf, sizeof(buf)) < 0) {
// XXX: Should this be changed to IESTREAMCONNECT?
i_errno = IESTREAMWRITE;
return -1;
}
/* Wait until the server confirms the client UDP write */
// XXX: Should this read be TCP instead?
if ((sz = recv(s, &buf, sizeof(buf), 0)) < 0) {
i_errno = IESTREAMREAD;
return -1;
}
return s;
}
/* iperf_udp_init
*
* initializer for UDP streams in TEST_START
*/
int
iperf_udp_init(struct iperf_test *test)
{
return 0;
}
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